US4822382A - Composite membranes, their manufacture and their use - Google Patents
Composite membranes, their manufacture and their use Download PDFInfo
- Publication number
- US4822382A US4822382A US07/115,913 US11591387A US4822382A US 4822382 A US4822382 A US 4822382A US 11591387 A US11591387 A US 11591387A US 4822382 A US4822382 A US 4822382A
- Authority
- US
- United States
- Prior art keywords
- poly
- bisphenol
- composite membrane
- tetramethyl
- terephthalate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/48—Polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/19—Hydroxy compounds containing aromatic rings
- C08G63/193—Hydroxy compounds containing aromatic rings containing two or more aromatic rings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2913—Rod, strand, filament or fiber
- Y10T428/2933—Coated or with bond, impregnation or core
- Y10T428/2964—Artificial fiber or filament
- Y10T428/2967—Synthetic resin or polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- External Artificial Organs (AREA)
Abstract
Description
Claims (48)
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/115,913 US4822382A (en) | 1987-11-02 | 1987-11-02 | Composite membranes, their manufacture and their use |
KR1019890701241A KR950004142B1 (en) | 1987-11-02 | 1988-10-31 | Impoved composite membranes, their manufacture and their use |
EP88910341A EP0348459B1 (en) | 1987-11-02 | 1988-10-31 | Improved composite membranes, their manufacture and their use |
PCT/US1988/003799 WO1989004199A1 (en) | 1987-11-02 | 1988-10-31 | Improved composite membranes, their manufacture and their use |
JP63509542A JPH02501991A (en) | 1987-11-02 | 1988-10-31 | Improved composite membranes, their manufacture and use |
DE88910341T DE3881874T2 (en) | 1987-11-02 | 1988-10-31 | COMPOSED MEMBRANES, THEIR PRODUCTION AND USE. |
BR888807281A BR8807281A (en) | 1987-11-02 | 1988-10-31 | PERFECT COMPOSED MEMBRANES, THEIR MANUFACTURE AND USE |
AT88910341T ATE90590T1 (en) | 1987-11-02 | 1988-10-31 | COMPOSITE MEMBRANES, THEIR MANUFACTURE AND USE. |
MX013646A MX167191B (en) | 1987-11-02 | 1988-11-01 | IMPROVED MIXED MEMBRANES, THEIR MANUFACTURE AND USE |
ES8803338A ES2015355A6 (en) | 1987-11-02 | 1988-11-02 | Improved composite membranes, their manufacture and their use. |
CN88108820A CN1029666C (en) | 1987-11-02 | 1988-11-02 | Improved composite membranes, their manufacture and their use |
CA000582009A CA1321931C (en) | 1987-11-02 | 1988-11-02 | Composite membranes, their manufacture and their use |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/115,913 US4822382A (en) | 1987-11-02 | 1987-11-02 | Composite membranes, their manufacture and their use |
CN88108820A CN1029666C (en) | 1987-11-02 | 1988-11-02 | Improved composite membranes, their manufacture and their use |
Publications (1)
Publication Number | Publication Date |
---|---|
US4822382A true US4822382A (en) | 1989-04-18 |
Family
ID=36716574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/115,913 Expired - Fee Related US4822382A (en) | 1987-11-02 | 1987-11-02 | Composite membranes, their manufacture and their use |
Country Status (11)
Country | Link |
---|---|
US (1) | US4822382A (en) |
EP (1) | EP0348459B1 (en) |
JP (1) | JPH02501991A (en) |
CN (1) | CN1029666C (en) |
AT (1) | ATE90590T1 (en) |
BR (1) | BR8807281A (en) |
CA (1) | CA1321931C (en) |
DE (1) | DE3881874T2 (en) |
ES (1) | ES2015355A6 (en) |
MX (1) | MX167191B (en) |
WO (1) | WO1989004199A1 (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4944880A (en) * | 1989-10-16 | 1990-07-31 | Exxon Research And Engineering Company | Polyimide/aliphatic polyester copolymers |
US4994095A (en) * | 1988-12-27 | 1991-02-19 | Union Carbide Industrial Gases Technology Corporation | Semipermeable membranes based on specific 4,4'-(1H-alkylidene)bis[2,3,6-trialkylphenol]type polyesters |
US5055114A (en) * | 1988-12-27 | 1991-10-08 | Union Carbide Industrial Gases Technology Corporation | Semipermeable membranes based on specified tetrabromobisphenol type polyesters |
US5104532A (en) * | 1989-09-15 | 1992-04-14 | Exxon Research And Engineering Company | Flat stack permeator |
US5152811A (en) * | 1991-12-20 | 1992-10-06 | The Dow Chemical Company | Meta, para-bisphenol based polymer gas separation membranes |
US5202183A (en) * | 1988-07-11 | 1993-04-13 | Mitsubishi Rayon Co., Ltd. | Alkali-resistant synthetic fiber |
US5202393A (en) * | 1991-08-22 | 1993-04-13 | Eastman Kodak Company | Blend of a polyester and a polycarbonate |
US5202392A (en) * | 1991-08-22 | 1993-04-13 | Eastman Kodak Company | Blend of a polyester and a polycarbonate |
US5252680A (en) * | 1991-08-22 | 1993-10-12 | Eastman Kodak Company | Blend of a polyester and a polycarbonate |
US5352273A (en) * | 1993-04-14 | 1994-10-04 | E. I. Du Pont De Nemours And Company | Alkyl substituted aromatic polyester gas separation membranes |
US5650479A (en) * | 1995-06-06 | 1997-07-22 | The Cynara Co. | Interfacially polymerized polyester films |
US5669959A (en) * | 1996-05-16 | 1997-09-23 | Uop | Process for safe membrane operation |
US6168649B1 (en) * | 1998-12-09 | 2001-01-02 | Mg Generon, Inc. | Membrane for separation of xenon from oxygen and nitrogen and method of using same |
US20070102372A1 (en) * | 2005-11-10 | 2007-05-10 | Ismael Ferrer | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US7329306B1 (en) | 2004-12-02 | 2008-02-12 | Uop Llc | Process for safe membrane operation |
US20100018394A1 (en) * | 2008-06-30 | 2010-01-28 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Hollow Organic/Inorganic Composite Fibers, Sintered Fibers, Methods of Making Such Fibers, Gas Separation Modules Incorporating Such Fibers, and Methods of Using Such Modules |
US20100294132A1 (en) * | 2007-10-29 | 2010-11-25 | Shin-Etsu Polymer Co., Ltd. | Asymmetric membrane and air-conditioning system using the same |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5179659B2 (en) * | 2008-07-02 | 2013-04-10 | ユーオーピー エルエルシー | Mixed matrix membrane incorporating microporous polymer as filler |
Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US30351A (en) * | 1860-10-09 | Piston for steam-engines | ||
US3579607A (en) * | 1969-01-17 | 1971-05-18 | Union Carbide Corp | Polyester-substituted organosilicon compositions |
US3822202A (en) * | 1972-07-20 | 1974-07-02 | Du Pont | Heat treatment of membranes of selected polyimides,polyesters and polyamides |
US3957651A (en) * | 1971-12-16 | 1976-05-18 | Chemical Systems Incorporated | Microporous polyester membranes and polymer assisted phase inversion process for their manufacture |
JPS5230524A (en) * | 1975-09-03 | 1977-03-08 | Kingujimu:Kk | Apparatus for classifying and assorting x-ray films |
JPS5366880A (en) * | 1976-11-27 | 1978-06-14 | Sumitomo Chem Co Ltd | Production for gas with increased or decreased oxygen |
US4207192A (en) * | 1978-09-19 | 1980-06-10 | Albany International Corp. | Hollow filament separatory module and method of fabrication |
JPS55134629A (en) * | 1979-04-06 | 1980-10-20 | Teijin Ltd | Selective permeable membrane for separating gas |
US4364759A (en) * | 1979-03-28 | 1982-12-21 | Monsanto Company | Methods for preparing anisotropic hollow fiber membranes comprising polymer of acrylonitrile and styrene and hollow fiber membranes produced therefrom |
US4439217A (en) * | 1981-11-27 | 1984-03-27 | Asahi Glass Company, Ltd. | Permselective element for gas separation |
JPS59120206A (en) * | 1982-12-27 | 1984-07-11 | Agency Of Ind Science & Technol | Selective separation membrane |
US4467001A (en) * | 1982-12-27 | 1984-08-21 | Albany International Corp. | Process and device for applying, drying and curing a coating on filaments |
JPS59216603A (en) * | 1983-05-25 | 1984-12-06 | Agency Of Ind Science & Technol | Composite membrane for separating gas |
US4528004A (en) * | 1981-07-08 | 1985-07-09 | Ube Industries, Ltd. | Aromatic polyimide composite separating membrane |
US4568579A (en) * | 1983-11-03 | 1986-02-04 | Owens-Illinois, Inc. | Asymmetrical layered structures of polyalkylene sulfone resins |
DE3445291C1 (en) * | 1984-12-12 | 1986-04-30 | Gesellschaft für Schwerionenforschung mbH, 6100 Darmstadt | Process for separating gaseous or vaporous or liquid substance mixtures from one another by means of diffusion through membranes |
US4652283A (en) * | 1983-06-30 | 1987-03-24 | Monsanto Company | Polyphenylene oxide membrane having chemically bonded coating |
US4666644A (en) * | 1983-11-03 | 1987-05-19 | Owens-Illinois, Inc. | Method of making asymmetrical layered structures from polyalkylene sulfone resins |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4214020A (en) * | 1977-11-17 | 1980-07-22 | Monsanto Company | Processes for coating bundles of hollow fiber membranes |
-
1987
- 1987-11-02 US US07/115,913 patent/US4822382A/en not_active Expired - Fee Related
-
1988
- 1988-10-31 BR BR888807281A patent/BR8807281A/en unknown
- 1988-10-31 EP EP88910341A patent/EP0348459B1/en not_active Expired - Lifetime
- 1988-10-31 WO PCT/US1988/003799 patent/WO1989004199A1/en active IP Right Grant
- 1988-10-31 DE DE88910341T patent/DE3881874T2/en not_active Expired - Fee Related
- 1988-10-31 AT AT88910341T patent/ATE90590T1/en active
- 1988-10-31 JP JP63509542A patent/JPH02501991A/en active Pending
- 1988-11-01 MX MX013646A patent/MX167191B/en unknown
- 1988-11-02 ES ES8803338A patent/ES2015355A6/en not_active Expired - Lifetime
- 1988-11-02 CA CA000582009A patent/CA1321931C/en not_active Expired - Fee Related
- 1988-11-02 CN CN88108820A patent/CN1029666C/en not_active Expired - Fee Related
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US30351A (en) * | 1860-10-09 | Piston for steam-engines | ||
US3579607A (en) * | 1969-01-17 | 1971-05-18 | Union Carbide Corp | Polyester-substituted organosilicon compositions |
US3957651A (en) * | 1971-12-16 | 1976-05-18 | Chemical Systems Incorporated | Microporous polyester membranes and polymer assisted phase inversion process for their manufacture |
US3822202A (en) * | 1972-07-20 | 1974-07-02 | Du Pont | Heat treatment of membranes of selected polyimides,polyesters and polyamides |
JPS5230524A (en) * | 1975-09-03 | 1977-03-08 | Kingujimu:Kk | Apparatus for classifying and assorting x-ray films |
JPS5366880A (en) * | 1976-11-27 | 1978-06-14 | Sumitomo Chem Co Ltd | Production for gas with increased or decreased oxygen |
US4207192A (en) * | 1978-09-19 | 1980-06-10 | Albany International Corp. | Hollow filament separatory module and method of fabrication |
US4364759A (en) * | 1979-03-28 | 1982-12-21 | Monsanto Company | Methods for preparing anisotropic hollow fiber membranes comprising polymer of acrylonitrile and styrene and hollow fiber membranes produced therefrom |
JPS55134629A (en) * | 1979-04-06 | 1980-10-20 | Teijin Ltd | Selective permeable membrane for separating gas |
US4528004A (en) * | 1981-07-08 | 1985-07-09 | Ube Industries, Ltd. | Aromatic polyimide composite separating membrane |
US4439217A (en) * | 1981-11-27 | 1984-03-27 | Asahi Glass Company, Ltd. | Permselective element for gas separation |
JPS59120206A (en) * | 1982-12-27 | 1984-07-11 | Agency Of Ind Science & Technol | Selective separation membrane |
US4467001A (en) * | 1982-12-27 | 1984-08-21 | Albany International Corp. | Process and device for applying, drying and curing a coating on filaments |
JPS59216603A (en) * | 1983-05-25 | 1984-12-06 | Agency Of Ind Science & Technol | Composite membrane for separating gas |
US4652283A (en) * | 1983-06-30 | 1987-03-24 | Monsanto Company | Polyphenylene oxide membrane having chemically bonded coating |
US4568579A (en) * | 1983-11-03 | 1986-02-04 | Owens-Illinois, Inc. | Asymmetrical layered structures of polyalkylene sulfone resins |
US4666644A (en) * | 1983-11-03 | 1987-05-19 | Owens-Illinois, Inc. | Method of making asymmetrical layered structures from polyalkylene sulfone resins |
DE3445291C1 (en) * | 1984-12-12 | 1986-04-30 | Gesellschaft für Schwerionenforschung mbH, 6100 Darmstadt | Process for separating gaseous or vaporous or liquid substance mixtures from one another by means of diffusion through membranes |
Non-Patent Citations (8)
Title |
---|
Cabasso et al., "Composite Hollow Fiber Membranes", J. of Applied Polymer Science, vol. 23, 1509-1525, (1979). |
Cabasso et al., "Polysulfone Hollow Fibers, II. Morphology", J. of Applied Polymer Science, vol. 21, 165-180, (1977). |
Cabasso et al., "Research & Development of NS-1 & Related Polysulfone Hollow Fibers for Reverse Osmosis Desalination of Seawater", Office of Water Research & Technology, 7/75. |
Cabasso et al., Composite Hollow Fiber Membranes , J. of Applied Polymer Science, vol. 23, 1509 1525, (1979). * |
Cabasso et al., Polysulfone Hollow Fibers, II. Morphology , J. of Applied Polymer Science, vol. 21, 165 180, (1977). * |
Cabasso et al., Research & Development of NS 1 & Related Polysulfone Hollow Fibers for Reverse Osmosis Desalination of Seawater , Office of Water Research & Technology, 7/75. * |
Pilato et al., "Polymers for Permselective Membrane Gas Separations", ACSP Reprints, 16, 41-44, (1975). |
Pilato et al., Polymers for Permselective Membrane Gas Separations , ACSP Reprints, 16, 41 44, (1975). * |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5202183A (en) * | 1988-07-11 | 1993-04-13 | Mitsubishi Rayon Co., Ltd. | Alkali-resistant synthetic fiber |
US4994095A (en) * | 1988-12-27 | 1991-02-19 | Union Carbide Industrial Gases Technology Corporation | Semipermeable membranes based on specific 4,4'-(1H-alkylidene)bis[2,3,6-trialkylphenol]type polyesters |
US5055114A (en) * | 1988-12-27 | 1991-10-08 | Union Carbide Industrial Gases Technology Corporation | Semipermeable membranes based on specified tetrabromobisphenol type polyesters |
US5104532A (en) * | 1989-09-15 | 1992-04-14 | Exxon Research And Engineering Company | Flat stack permeator |
US4944880A (en) * | 1989-10-16 | 1990-07-31 | Exxon Research And Engineering Company | Polyimide/aliphatic polyester copolymers |
US5202393A (en) * | 1991-08-22 | 1993-04-13 | Eastman Kodak Company | Blend of a polyester and a polycarbonate |
US5202392A (en) * | 1991-08-22 | 1993-04-13 | Eastman Kodak Company | Blend of a polyester and a polycarbonate |
US5252680A (en) * | 1991-08-22 | 1993-10-12 | Eastman Kodak Company | Blend of a polyester and a polycarbonate |
US5152811A (en) * | 1991-12-20 | 1992-10-06 | The Dow Chemical Company | Meta, para-bisphenol based polymer gas separation membranes |
US5352273A (en) * | 1993-04-14 | 1994-10-04 | E. I. Du Pont De Nemours And Company | Alkyl substituted aromatic polyester gas separation membranes |
WO1994023830A1 (en) * | 1993-04-14 | 1994-10-27 | L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Alkyl substituted aromatic polyester gas separation membranes |
US5650479A (en) * | 1995-06-06 | 1997-07-22 | The Cynara Co. | Interfacially polymerized polyester films |
US5669959A (en) * | 1996-05-16 | 1997-09-23 | Uop | Process for safe membrane operation |
US6168649B1 (en) * | 1998-12-09 | 2001-01-02 | Mg Generon, Inc. | Membrane for separation of xenon from oxygen and nitrogen and method of using same |
US7329306B1 (en) | 2004-12-02 | 2008-02-12 | Uop Llc | Process for safe membrane operation |
US20070102372A1 (en) * | 2005-11-10 | 2007-05-10 | Ismael Ferrer | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US7641055B2 (en) | 2005-11-10 | 2010-01-05 | Donaldson Company, Inc. | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US20100018934A1 (en) * | 2005-11-10 | 2010-01-28 | Donaldson Company, Inc. | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US7910003B2 (en) | 2005-11-10 | 2011-03-22 | Donaldson Company, Inc. | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US20110135901A1 (en) * | 2005-11-10 | 2011-06-09 | Donaldson Company, Inc. | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US8141716B2 (en) | 2005-11-10 | 2012-03-27 | Donaldson Company, Inc. | Polysulfone and poly(N-vinyl lactam) polymer alloy and fiber and filter materials made of the alloy |
US20100294132A1 (en) * | 2007-10-29 | 2010-11-25 | Shin-Etsu Polymer Co., Ltd. | Asymmetric membrane and air-conditioning system using the same |
US8394183B2 (en) * | 2007-10-29 | 2013-03-12 | Shin-Etsu Polymer Co., Ltd. | Asymmetric membrane and air-conditioning system using the same |
US20100018394A1 (en) * | 2008-06-30 | 2010-01-28 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Hollow Organic/Inorganic Composite Fibers, Sintered Fibers, Methods of Making Such Fibers, Gas Separation Modules Incorporating Such Fibers, and Methods of Using Such Modules |
US8268041B2 (en) * | 2008-06-30 | 2012-09-18 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Hollow organic/inorganic composite fibers, sintered fibers, methods of making such fibers, gas separation modules incorporating such fibers, and methods of using such modules |
Also Published As
Publication number | Publication date |
---|---|
ES2015355A6 (en) | 1990-08-16 |
BR8807281A (en) | 1990-02-13 |
EP0348459A1 (en) | 1990-01-03 |
JPH02501991A (en) | 1990-07-05 |
MX167191B (en) | 1993-03-09 |
CN1029666C (en) | 1995-09-06 |
WO1989004199A1 (en) | 1989-05-18 |
CA1321931C (en) | 1993-09-07 |
DE3881874T2 (en) | 1993-09-30 |
ATE90590T1 (en) | 1993-07-15 |
DE3881874D1 (en) | 1993-07-22 |
CN1043885A (en) | 1990-07-18 |
EP0348459B1 (en) | 1993-06-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: UNION CARBIDE CORPORATION, OLD RIDGEBURY ROAD, DAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NELSON, JOYCE K.;REEL/FRAME:004805/0698 Effective date: 19871028 Owner name: UNION CARBIDE CORPORATION, OLD RIDGEBURY ROAD, DAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NELSON, JOYCE K.;REEL/FRAME:004805/0698 Effective date: 19871028 |
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Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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Owner name: UNION CARBIDE INDUSTRIAL GASES INC., CONNECTICUT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNION CARBIDE CORPORATION;REEL/FRAME:006335/0809 Effective date: 19881230 |
|
AS | Assignment |
Owner name: PRAXAIR TECHNOLOGY, INC., CONNECTICUT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNION CARBIDE INDUSTRIAL GASES CORPORATION;REEL/FRAME:006459/0523 Effective date: 19930407 |
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FEPP | Fee payment procedure |
Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 8 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20010418 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |